thermobarometer ( def 1 ).

1860–65; hypso- + -meter

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World English Dictionary
hypsometer (hɪpˈsɒmɪtə)
1.  an instrument for measuring altitudes by determining the boiling point of water at a given altitude
2.  any instrument used to calculate the heights of trees by triangulation

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American Heritage
Science Dictionary
hypsometer   (hĭp-sŏm'ĭ-tər)  Pronunciation Key 
An instrument used to determine land elevation by observing the atmospheric pressure as measured by the change in the boiling point of a liquid, usually water. Liquids boil at progressively lower temperatures as the atmospheric pressure decreases, and since atmospheric pressure decreases with altitude, the temperature at which the liquid boils is an indicator of the atmospheric pressure at that location and hence of the location's altitude.
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Example sentences
Height of short trees can be measured with a graduated rod, but taller trees usually require a hypsometer.
Students construct and use a hypsometer to measure several tall structures on the school grounds.
The hypsometer bases its measurement on the known boiling-point of a fluid at a specific external pressure.
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